Friction-gear.



c. B. PATCH. FRICHON GEAR. APPLICATION FILED SEPT. 8. ISIS.

Patented Sept. 10,1918;

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FEICTZiEIQ-GEAE.

Specification of letters Eetent.

application filed September 8, 1916. Serial N 0. 118,921.

To all whom it may concern:

Be it known that I, CALVIN B. PATcH, a citizen of the United States, residing at Glenellyn, in the county of Dupage and State of Illinois, have invented a certain new and useful Improvement in Friction- Gears, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to improvements in friction gears.

The object of the invention is to provide a relatively inexpensive friction gear for railway cars and wherein the friction shell may be readily renewed or replaced.

In the drawing forming a part of this specification, Figure 1 is a vertical, longitudinal section of a draft rigging showing my improvements in connection therewith. Eig. 2 is a horizontal sectional view of the structure illustrated in Fig. 1 and taken on the line 22 thereof. Fig. 3 is a vertical,

transverse sectional view taken substantially on the line 3-3 of 1. And Fig. 4 is a detail sectional View illustrating a difierent type of yolre which may be employed with my invent1on.

' In said drawing, 10-10 denote channel shaped center or draft sills between which areinounted the front upper and lower stops 11 and 12, respectively. The upper front stop 11 is :riveted to the sills 10 by'sids flanges 13 and has avertical stop shoulder 14 andhorizontal web 15, the shoulder being suitably reinforced by ribs 16. The lower stop 12 is shown as secured to the lower flanges of the sills as by the rivets 17 and said stop is provided with a vertical shoulder 18 on its rear and a horizontal shelf or ledge 19 which forms a support for the butt of the draw bar 20.

y The draw bar 20 is connected to the'yoke A by means of a coupler key 21, the latter extending through suitable slots 22 in the front ends of the arms of the yoke and also through slots 23 in the sills. The normal position of the parts is shown in Fig. 2 where the coupler key 21 engages the rear of the slots 23 and is thus prevented from r V A warclly extended flanges rearward movement. To reinforce the sills the slots 22 in the yoke are only slightly longer than the width of the key 21 so that the yoke A. is revented from rearward movement under uif. -The yoke A, which is horizontally arranged, consists of side arms 2525, the rear ends of which are bent inwardly and connected by a cross piece 26. Approximately centrally of the arms 25, the same are provided with slots 2?, in which are received laterally extended lugs 28 formed integrally with a cylindrical friction shell 29. The lugs 25% fit snugly within "the slots 27 and the shell is assembled with hence may be cheaply manufactured since it '18 formed with a minimum amount of-ma terial. Within the shell 29 is a circularly arranged set of friction shoes 30 with which cooperates a wedge 31, a plurality of antirateaeee se t. so, acre.

friction rollers 32 being interposed between the shoes and wedge. Within the shoes, at their rear ends, is mounted a washer 33 and the shoes engage an outer heavy spring 34 and an inner lighter spring 35, the rear ends or said springs bearing against the cross piece 26 of the yoke. A connecting bolt 36 extendsfrom the wedge to the rear of the yoke and is thus adapted to hold the parts in assembled position and the springs under an initial compression. The wedge '31 engages the rear face of 'a front follower 37, the sides of said follower being notched or recessed as indicated-at 38 to accommodate the side arms of the yoke. The cylinder 29 is supported by a saddle plate 39 which is detachably bolted to the lower flanges of the sills, said saddle plate 39 being extended upwardly at the center and provided with a curved bearing seat 40 to fit the underside of the cylinder. From the preceding, it will be seen that the shell is supported by the saddle plate and the shell in turn supports the yoke.

in the construction illustrated in Fig.- i, the arms 125, 125 of the yoke are made separate and are ccnnected at tieir rear ends by means of a plate 126, the latter having rear- 45 which are seatgrooves 4:6 formed ed within corresponding arms by upsetting at the of the yoke Elli) or bending the ends of the latter. The plate 126 is secured to the yoke arms by means of bolts 47. 5

In operation, under draft, the front follower 37 remains stationary and the yoke and shell move in unison with the draw bar,

- thus actuating the friction mechanism. Un- ,der buff, the yoke A is held stationary by the key 21 so that the frictionshell is also held stationary. As the draw bar moves in Wardly over the key 21, the front follower 37 is forced rearwardly, thus actuating the wedge and other elements of the fIlClVlOn mechanism.

Although I have herein shown and described what I now consider the preferred ,said stops, a horizontal yoke, means preventing rearward movement of said yoke under buff, a friction shell detachably but rigidly connected with said yoke and held thereby against rearward movement, friction ele-. ments cooperable with said shell, and a spring within the yoke, the rear end of the spring being held by said yoke.

2. In a friction gear, the combination with a draw bar, front stops, a follower cooperating with said stops, of a horizontal yoke, a key connecting said yoke and draw bar, said key remaining stationary under buff and preventing rearward movement of the yoke, a friction shell. detachably connected with said yoke and movable in unison therewith, the yoke preventingrearward movement of the shell, friction elements cooperable with said shell, and a spring,ithe yoke forming the rear stop for the spring. 3

3. In a. friction gear, the combination with draft sills and front stop members, of a draw bar, a yoke, connections between the draw bar and yoke, the yoke being prevented from inward movement under bufi' and the draw bar being movable independently thereof under buff, a short friction shell detachably connected with said'yoke and prevented from rearward movement by aid yoke, friction elements cooperating with said shell, a follower coiiperating with said stops, and spring means interposed between said spring.

4. In a draft rigging for railway cars, the

combination with draft sills, a front follower, and stops for said follower, of a draw bar, a yoke, means for preventing rearward movement of said yoke under-buff, connections betweensaid draw bar and yoke arranged to move the yoke in unison with the draw bar in draft and permitting rearward movement of the draw bar independently of the yoke under buff, a short friction shell rigid with respect to the yoke and held stationary by the latter in buff, friction elements coiiperable with said shell, and spring means interposed between said friction elements and the rear end of the yoke, the latter acting as a rear stop for said spring.

5. As an article of manufacture, a relatively short friction shell for friction draft riggings, said shell being open at each end and provided on its exterior at diametrically disposed points with radially extending lugs, said lugs being adapted to cooperate with openings in the yoke-actmg member of the draft rigging.

6. In a draft rigging for railway cars, the

combination with draft sills and a draw bar, of yoke-acting means including horizontally extending side arms, connecting means between said yoke-acting means and draw bar adapting. the draw bar and yoke-acting meansti? move forwardly under draft in unison and permit the draw bar to move rearwardly under bud independently of the yoke-acting means, a relatively short friction shell detachably connected with said yoke-acting means and movable in unison therewith, friction elements cooperable with said shell, a member interposed between said friction elements and the rear end of the draw bar wherehy pressure from the draw bar is transmitted to Said friction elements, means for preventing forward movement of said member under draft, a spring interposed between said friction elements and the rear end of the yoke-acting means, and means for preventing rearward movement of said friction shell under draft.

In witness that I claim the foregoing I have hereunto subscribed my name this 5th day of Sept. 1916-.

CALVIN B. PATCH. 

